it’s that they basically created a ddos attack with how they were scraping the data.
This is trivial to mitigate with a common-sense throttling. You throttle at a level that would not bother a human, but would still block a bot. Almost all websites like Instagram do this.
Someone was scraped Midjourney's gallery website fast enough to cause a mild DoS attack. So they're kind of mad about that. They don't seem to have a lot of overhead. They can barely run all of their services from what I understand.